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Edwin H. Armstrong papers, 1886-1982, bulk 1912-1954

295.7 linear feet
Abstract Or Scope

Professional and personal files including Armstrong's correspondence with professional associations, other engineers, and friends, his research notes, circuit diagrams, lectures, articles, legal papers, and other related materials. Of his many inventions and developments, the most important are: 1) the regenerative or feedback circuit, 1912, the first amplified radio reception, 2) the superheterodyne circuit, 1918, the basis of modern radio and radar, 3) superregeneration, 1922, a very simple, high-power receiver now used in emergency mobile service, and 4) frequency modulation - FM, 1933, static-free radio reception of high fidelity. More than half the files concern his many lawsuits, primarily with Radio Corporation of America, over infringement of the Armstrong patents. Litigation continued until 1967. Other files deal with his work in the Marcellus Hartley Research Laboratory at Columbia University, 1913-1935, and with the American Expeditionary Forces in France during World War I, his Air Force contracts for communications development, Army research during World War II, the Radio Club of America, the Institute of Radio Engineers, FM development at his radio station at Alpine, N.J., the use of FM in television, his involvement in Federal Communications Commission hearings and legislation, and his work with the Zenith Radio Corporation. Also, letters to H.J. Round

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Edward Abbott papers, 1899

0.5 linear feet
Abstract Or Scope

The diary is a detailed account of Abbott's trip from Sydney, Australia to the Philippines, Hong Kong, Macao, China and Japan. There are numerous pen-and-ink sketches of landscape, architecture, historical sites, and inhabitants, and maps, some in water color. Pasted in the volume are memorabilia such as menus, hotel brochures, postcards, photographs, clippings, calling cards, etc. Of special interest are his accounts of the various native Christian communities he visited. Following the text there is a name index. In addition to the volume there are some related letters, documents, memorabilia and published maps.

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